Laser trapping and assembling of nanoparticles at solution surface studied by reflection micro-spectroscopy

Shun Fa Wang, Ken Ichi Yuyama*, Teruki Suigiyama, Hiroshi Masuhara

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We present the laser power dependent behavior of optical trapping assembling of 208-nm polystyrene (PS) nanoparticles at the solution surface layer. The assembling dynamics is examined by reflection microspectroscopy as well as transmission and backscattering imaging. The transmission imaging shows that the laser irradiation at the solution surface layer forms a nanoparticle assembly, whose diameter becomes large with the increase in the laser power. The backscattering image of the assembly gives structural color, meaning that nanoparticles are periodically arranged over the whole assembly region. In reflection microspectroscopy, one band appears at long wavelength and is gradually shifted to the short wavelength with the irradiation. After the blue shift, the reflection band is located at the shorter wavelength under the laser irradiation at the higher power. We discuss these spectral changes from the viewpoint of the inter-particle distance determined by the dynamic balance between attractive optical force and repulsive electrostatic force among nanoparticles.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation XII
EditorsGabriel C. Spalding, Kishan Dholakia, Kishan Dholakia, Gabriel C. Spalding
PublisherSPIE
ISBN (Electronic)9781628417142, 9781628417142
DOIs
StatePublished - Aug 2015
EventOptical Trapping and Optical Micromanipulation XII - San Diego, United States
Duration: 9 Aug 201512 Aug 2015

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9548
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptical Trapping and Optical Micromanipulation XII
CountryUnited States
CitySan Diego
Period9/08/1512/08/15

Keywords

  • colloidal crystal
  • optical trapping
  • polystyrene nanoparticle
  • reflection microspectroscopy
  • solution surface
  • structural color

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